Worksheet 10.1
The immune system
The lists below show seven terms and seven descriptions.
1 a Draw a line from each term to its description.
Term
pathogen
Description
&
proteins secreted by lymphocytes
in response to the presence of
an antigen
antigen
resistance to a pathogen as a result
of making your own antibodies
antibodies
a white blood cell that secretes
antibodies
passive immunity
an organism or virus that causes
disease
active immunity
a white blood cell that ingests and
digests bacteria
phagocyte
a molecule on the surface of a cell or
virus that is recognised as foreign by
white blood cells
lymphocyte
resistance to a pathogen as a result
of having antibodies provided by
another organism
© Cambridge University Press 2014 IGCSE® Biology
Worksheet 10.1
1
b Use one of the terms from the list to complete each of the following sentences. You can
use each term once, more than once or not at all.
i
A baby receives
antibodies
This is an example of
ii
passive
When bacteria get into the body,
antigens
specific
iii The
iv
A
antibodies
pathogen
phagocyte
lymphocyte
© Cambridge University Press 2014 IGCSE® Biology
from its mother in breast milk.
immunity.
lymphocytes
detect the
on the surfaces of the bacterial cells and secrete
to help to destroy them.
that causes influenza is a virus.
has a lobed nucleus, whereas a
has a large, rounded nucleus that almost fills the cell.
Worksheet 10.1
2
Worksheet 11.1
Aerobic and anaerobic respiration
Write each of the following statements into the correct column or columns in the table. Some
should go into one column, some into two columns and some into all three columns.
A ◆ Energy is released from glucose.
◆ Carbon dioxide is produced.
◆ Lactic acid is produced.
◆ Water is produced.
◆ Oxygen is used.
B
E
Aerobic respiration
Anaerobic respiration in yeast
B
A
AB
Anaerobic respiration
in humans
AC
DE
© Cambridge University Press 2014 IGCSE® Biology
Worksheet 11.1
1
Worksheet 11.2
Respiration equations
1 This equation represents a type of respiration.
6
C6H12O6 + 6O2 →
6
CO2 +
H2O
a What type of respiration is shown by the equation?
respiration.
aerobic
b How many carbon atoms are there on the left-hand side of the equation?
b
6 1
+
c How many oxygen atoms are there on the left-hand side of the equation?
18
d Balance the equation by writing numbers in the two spaces.
e Explain what is meant by a ‘balanced equation’.
A balanced equation is
a
chemical equation that
shows the same number and type of atoms for each
element
on
both side
of the
arrow,
2 Complete the balanced equation for anaerobic respiration in yeast.
C6H12O6
->
2CH50H
+2CO2.
3 Write the word equation for anaerobic respiration in humans.
glucose ->
lactic
© Cambridge University Press 2014 IGCSE® Biology
acid.
Worksheet 11.2
1